I found in the OEIS solution for 3xN (A059021 - OEIS) and for 2xN (A059020 - OEIS).
How to derive a formula for finding the number of cycles in the grid NxM?
I found in the OEIS solution for 3xN (A059021 - OEIS) and for 2xN (A059020 - OEIS).
How to derive a formula for finding the number of cycles in the grid NxM?